I often see requests here for chords to songs.

If you have a MIDI with accompaniment, my program MIDI chords will tell you what chords are being played, and can even simplify the complicated ones.

You can buy it from Hands-on MIDI software.

It doesn't cost much, and there is a free demo to download. It can transpose the chords into any key.

I have also written a shareware program which will transpose the actual MIDI if necessary